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D. C. LARSON STO'P MOTION APPARATUS.

APPLICATION FILED SEPT-16,1916. 1 ,3 1 1 ,655. Patented July 29, 1919.

2 SHEETS-SHEET I- WITNESSES:

INVENTOR Patented July 29, 1919.

2 SHEETS-SHEET 2.

l I I WITNESSES INVENTOR zaz. w

ATTORNEY THE COLUMBIA PLANOGRAPH cm. WASHINGTON D. C.

mwrnzc; A soEfoEYon EEs;NEW YORK, AssIGNoE rooms ELEVATOR coMrimY';

0E JERSEY-CITY; NEW JERSEY; A conromrloiv f oE'ivEw JERSEY? p 7' a STOP-MOTION APPAEBATUSE-- To: all whom z't-may 007L667%{' 7 Be it; known that. 1, DAVID C. LARSON, a citizen of the UnitediStates residinginv Yonkers, in thecounty: of. Vvestchester'a and State of New; York, have invented a new; and useful Improvement in Stop-Motion Apparatus of Whichthe followingis aspecification. v e r My invention relates to automatic stop-; motion devices K for use; inn connection with electric. elevators, and has for. its object to providena device. of the character above noted, involving.improved featuresqof cont struct-ion; and arrangementof-parts havingthe. mode of operationsubstantially as, heree inafter set forth.

. I In the. accompanying.- r drawings, Figures. 1 andQdllustrateside. and front views re.. spectively of'an. electric elevator system sufli cient :to. illustrate the application thereto of; the stop motion device; Fig. .3v. il-lustr.ates somewhat enlarged -f1ont.: .detail View of. :the stop motion device, with a front :cover plate removed, and with;certain otheraparts ini-sections; Fig. 4- .illustrates; inr-sectioir v a. view of Fig.- 3 taken Substantially-onthei line aa asvie'wedrin the'di'rection otzarrows. Zr-b; Fig. 5 illustrates a mannerzof mounting the switch mechanism, and Figs: 6 and 7 illustratedifi'erent views of amember used in H10l1l1tll1gthGiS\VltChE/Sp i The stop: motion devicein detail. consists ofabase 1 provided. with a removablefront I or-coverwplate Astop-Jmotion shaft "3 is supported by a. hub 4' which may formran integralupartofthebaseal. The-shaft 3 is provided with a-screw threadtportion 3" on which is-mounted what I willtermzherein a traveling nut-5. Thevtravelingnuttfi is. provided on its peripl1ery with gear teeth 6 adapted for engagementby a .pinion -7. Thea-teeth of tll'BgPiIllOll 7 .are constructed of sufiicient length to allow for movement ofthe nut axiallyh 1 a A switch actuating segmental: drum. 8 isrigidly connected to the 1 stop -motion shaft 3,'through the intermediary of a cylindrical member or hub 9 having a sp1it-1col1a'r.10, which is clampediby :a stud and-nut connection ll to t-he'screw threaded "portion a of theshaft'f8q The cylindrical'port-ion 8- of the-drum=85 is split at 8, and'clamped by a =stud and nut connection 12 to= the hub: The hub 9 is provided with a projecting Specification of Letters Patent. H Patented J i Application filed September.16;;1916 Serial-No 120,437.-

tooth 13 which; is adapted I for engagement b,y a projecting-tooth; 14 formed: on the travelingmutiaQ An arm-l5 rigidiwith the shaft 3,-. issprovidedwith aiprojecting tooth 16;.which is adapted y for: engagement. by. a

projecting tooth 17 formed on the traveling.

nut. I

Thedrum 8,-.as illustrateddn Fig 3; is in: a "normal :1 orv central I position, lt"be1-ngv adaptediwhen rotated or rooked 'in a clockwise direction to actuate a-.=double-row-series of electrical switchesA- A, A andvA -i, and when rotated. or rocked in. an anti-clockwise portion 18 andendl-ipieces l9.- A switch arm 20. in thetformcta; bell. crank is-pivotally supported at 21' by 1 a member 22: secured ito; the lIlSHliLlllOILi- A: roller-28 composed lot in sulati'onf material suchiyasi hard -rubber, fis carmed-by:thearm QO;v The:sWiteh-. a1=m,car

ries a contact 2&lv-which }is:normally-held in engagement with astationary-contact 25 by the} actionof-a. spr-ing'26z. The contact 24-=is separated from the contact? '25 by; the en'- gagement 20f the roller :23 with the-drum: '8. Each series: of switches comprises *ardouble row,- therev being interposed between the rows;,-'a segmental shaped member such as 5) togetherwith the-:member3s areibolted to the base .1, and the top. rovwof=-=switches are-bolte'd: ito -the members-v38; bolt i holes '1 2? 1n the. insulating member ibeinggprovidedz for tlnspurpose.} z Slots 28xandi28 formed in.

theibase 1--.and -member: 38; respectively, are

engaged the bolts -these slots: permitting propenadjiustment of-the; switches; It will be ll'l'otdath at: with thisamanner of mounting the-switches,. the-two rows=of-eachi series cansbe adjusted independentlyKof each. other.

The. gswitches- 1A and 213 comprise: a .p ain of contact carrying-arms129;?295 canried on a common .pintl'e: 30; rcanriedsabyiwthe basevl'; ,lThenarms 29, 29 each 'carry ra=ipair of metallic contacts 5 such as 131: zandi32; respec-:

sulafted from the ir. respective switch -'arms,

and additional insulating members '84; in the 7 form of are deflectors are secured to the e l- Each arm 29 and 29 carriesaroller 35', adapted for engagement by the drum 8, the engagement of either roller by the drum effecting the separation of the contacts carried by'the arms. V

The two pairs of contacts 29 and 29 are adapted to be connected in the 'mainline clamped to the base 1.}

The application of the present stop motion device to'one well known type of elevator apparatus is illustrated in I igs. 1 and '2, in which an electric motor M is connected to a winding drum D through -a -well known worm and gear connection E. 1k drive shaft is designated D, this shaft at one end, receiving the screw threaded portion of the pinion shaft 7 a suitable lock stud 7 being provided. The stop motion device is secured to the machine by the bolts 37.

The operation of the stop motion" device in conjunction with the elevator hoisting mechanism will now be described. 1 i The traveling nut 5 as will be particularly noted, is permanently connected to the drum shaft D, through the intermediary of the pinion 7, and'is thus rotatable at all times with the said shaft. Thus, rotation of the drum shaft in a clockwise direction,

as viewed from the right "handof F ig. 4, causes rotation of the traveling nut '5, in a like direction; this rotation-of the nut also causing movement of the latter axially in a left hand direction on the threaded shaft 4 which remains stationaryuntil the tooth 17 on the nut engages the tooth 16 on the arm 15. This clutching action between the'nut 5 and arm 15now causes the shaft 3 together with the segmental drum, to rotate withthe nut'5, the drum in this-instance'being rotated in a clockwise direction. The drum rotating in this direction, actuates or opens the series of switches, A, A, A and1A the latter switch disconnecting the motor M" from its source of power supply.

Rotation of the drum shaft Dat this time in an anti-clockwise direction, which corre-' sponds to a'reverse direction of car travel, eifects a like rotation .of' the nut 5, which permits the segmental drum 8' to return to centeror normal position as shown in Fig. 3 by the action of its own weight, thereby permitting the closing of the series of switches A, A, by the action of their associated springs. This rotationof the nut also causes a move ment thereoffaxially. in a right hand direction' on the threaded shaft 4, which remains stationary after the centering of the drum 8, until the toothl i on the nut engages the tooth 13 associated with the drum 8. The clutching action between the nut and tooth 13 causes the shaft 3. together with the segmental drum to rotate in an anti-clockwise direction with the nut. Thedrum rotating in this direction actuates or pens theseries ofswitches B, B, B and B I Rotation of the drum shaft D at this time, in a clockwise direction permits the segmental drum 8 to return to normal position as heretofore described, and permits the closing'of the series'of switches B, B, etc, by the action of their associated springs.

13, are adjustable independently of each other and also independently 'of the seg-' mental drum 8, thatis to say without rotating the drum from its center or vertical position. This adjustment permits of proper timing of the clutching action between the nut 5, the tooth 16 on the arm 15, and the drum tooth; 13. i In practice, the timing is such that the clutching actionbetween the nut 5'and arm 15 is' eflected when the elef vator car approaches one limit of its travel, and between the nut and tooth'13, as the car approaches the other limit of its travel. Having thus described the invention, what I claim as new and desire to secure by Let ters Patent of the United States is *1. In apparatus of the class described, the combination with a power unit having a reversible rotatable shaft, a stop motion device comprising a screw threaded shaft, a nut. movable axially by the saidscrew threads, a connection to rotate the nut at all times with the first named shaft, and

. It will 'beparticularly noted that the arm 1'5 andintermediate ring 9 bearing the toothmeans to connect the threaded shaft for rothreaded shaft in a clockwise or anti-clockwise direction with the nut, and'means actuated by the said threaded shaft.

3. In apparatus of the class described, the combination with a power unit comprising a rotatable shaft, an" automatic stop motion device comprising a screw threaded shaft, a traveling nut engaging the screw threads, a connection to effect rotation of the nut at all times with the first named shaft, means to effect rotation of the threaded shaft in a clockwise or anti-clockwise direction with the nut, and a segmental drum rotatable by the said shaft.

4. In a stop mechanism, the combination of a rotatable threaded shaft, a nut threaded thereon and free to turn axially thereon and also to move axially of the shaft, and having means adapting it to be turned by power, an arm, fast on the shaft to one side of the nut, to effect an engagement between the nut and the arm, and a stop-mechanism element proper, fast on the shaft to the other side of the nut, and means to effect an engagement between the said element and the nut.

5. In a stop mechanism, the combination,v

fast on the shaft to the other side of the nut, and means to effect an engagement between the nut and the said element. I

6. In a. stop mechanism, the combination of a rotatable shaft, threaded on one portion of its length, a nut also threaded thereon, and capable of both axial and longitudinal movement on the shaft, and having means adapting it to be turned by power, an arm, adapted to be secured fast on the shaft to one side of the nut, and means to eflect an engagement between thearm and the nut, and a stop-mechanism element proper, comprising a ring or hub, adapted to be adjustably secured fast on the shaft to one side of the nut. and a segmental drum, adapted to be adjustably secured fast on the said hub, and means to effect an engagement between the drum and nut.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DAVID C. LARSON.

Witnesses:

ERNEST L. GALE, J r., JAMES G. Bn'rHnLn.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 11.0. 

